Syrian rebels are claiming that Turkey tipped off members of the al Qaeda affiliate that kidnapped at least five U.S-backed Syrian opposition fighters late last month when they entered Syria after completing a Pentagon training program.

A new report released by Jane’s Terrorism and Insurgency Center shows that the majority of the Islamic State’s military activities in Syria have focused on non-governmental opposition groups, while only a small percentage have targeted the regime of Syrian president Bashar al-Assad.

Islamic State militants released a new propaganda video Sunday in which the terrorist group claimed to have raided and established control over the Mursitpinar border crossing between Turkey and Syria near the town of Kobani.